Best Chrome Extensions for Analyzing Zillow Investment Properties
A practical comparison of Chrome extensions that add rental metrics to Zillow—including cap rate, cash flow, and deal screening—and where Realy fits for serious investors.
Zillow shows photos and list price. It does not show cap rate, cash-on-cash, or monthly cash flow. Chrome extensions fill that gap—but they are not all built the same.
This guide compares what investors actually need and where Realy fits among popular Zillow tools.
What to Look For in a Zillow Investment Extension
| Feature | Why it matters |
|---|---|
| Cap rate & CoC on listings | Core screening metrics |
| Customizable assumptions | Your rate, down payment, expenses |
| Search-page bulk analysis | Rank 50+ listings at once |
| Map + table views | Pattern-spot by geography |
| Listing detail integration | Underwrite without leaving Zillow |
| Sync to web app | Save/share full reports |
| 1–4 unit residential focus | Matches most rental investors |
Realy — Full Zillow Investment Analytics
Best for: Investors who want institutional-style metrics on every Zillow listing with minimal spreadsheet work.
What you get:
- Search page: Draggable "Open Realy Analyzer" → table + map with cap rate, CoC, cash flow on every result
- Assumption control: Down payment (default 20%), closing costs (1%), rate (6.5%), taxes (2%), vacancy, insurance, HOA, maintenance, management
- Listing page: Resizable mini side panel + full metrics
- Deep dive: Detailed analysis on Realy.app with synced assumptions
- Shareable reports for partners and lenders
Metrics engine: NOI, cap rate, loaded cap rate, cash-on-cash, DSCR, rent/sqft, monthly OpEx + debt—calculated per Realy's calculatePropertyMetrics formulas.
Other Extensions Investors Use
The Chrome Web Store lists several Zillow analysis tools. Common categories:
| Tool type | Typical strength | Typical gap |
|---|---|---|
| Simple cash-flow calculators | Quick rent vs. payment | Limited bulk search analysis |
| Cap rate overlays | Single-listing metrics | Fewer assumption controls |
| Spreadsheet exporters | Data export | Still manual analysis |
| Comp/rent tools | Rent estimates | Less full underwriting |
Names you may see related to Zillow investing include CashOn, Doorhacker, Ostrich, and generic "Zillow deal analyzer" extensions. Evaluate each on: bulk search support, assumption flexibility, and whether metrics match how you underwrite (financing, taxes, vacancy).
Realy differentiates on search-level ranking (sort entire markets by CoC) and assumption sync across extension + app—not just a calculator popup on one listing.
Extension vs. Spreadsheet vs. Web App
| Workflow | Speed | Flexibility | Best use |
|---|---|---|---|
| Chrome extension | Fastest on Zillow | High (Realy assumptions) | Daily browsing |
| Spreadsheet | Slow | Unlimited | Custom models, LP reports |
| Realy.app | Medium | Highest detail | Final underwriting, sharing |
See: Realy vs spreadsheet workflow.
Our Recommendation
- Install one primary extension with bulk search + full metrics (Realy).
- Set conservative default assumptions before browsing.
- Shortlist by CoC or cap rate, then deep-dive winners only.
- Export or open detailed analysis for offers and partner review.